How to find 6 psi. of boost, f.k.a. to bypass or not...

["Frank Amoroso" <famoroso@sprintmail.com>]

In response to "To bypass, or not to bypass," Nick Pinto asked...

>Frank:
>
>I have a 93 S4 also.... what is the difference between the regular bypass
valve
>and the sport one.   Isn't the valve controlled by the computer???  So I
really
>don't understand the reason for a sport valve.   I am always looking for
>performance enhancements so I eagerly await your reply.

Couple of things:

I'm not sure which valve you are referring to that is computer controlled,
WGFV maybe? But the bypass valve is operated by vacuum and I believe it
routes air back to the turbo to keep it spinning during shifts.

I have no idea how the sport Q bypass valve differs. Thicker diaphragm?
Better response to higher boost levels? I'm not sure. Maybe someone with
knowledge could let us know (based on part #). I'm pretty sure that by
itself it does not make any more power, replace your busted up bypass valve
though and...

I found 6 psi of boost. Prior to I was getting 15.5 to 16 psi of boost. Took
the car for a test drive this morning and hit 22 psi in second gear, NICE.
Heh, heh, heh, a few laugh out loud cackles, and I must have found 25 to 35
bhp that I never knew I had. Boost comes on more smoothly now, spools up
more quickly and I finally have some power under 4000 rpm.

You can imagine how my eyes widened first time I nailed it in second gear.
Boost gauge swung around all the way past 20 psi and my back was pushed into
the seat.

So I drove around for a couple hours today with the accelerator firmly
planted, all the while watching as the boost gauge, tach and speedo rapidly
did their dance. Conversely I watched the fuel gauge make its way to empty.
Oh well, its only, as they say, petrol.

Frank--

PS: When I bought the car it was putting out 16 psi of boost so I thought
this was normal. The valve removes and re-installs within minutes, worth
checking into.